CN110311381A - A kind of alternating current-direct current mixing grid power electronic transformer passing through DC Line Fault - Google Patents
A kind of alternating current-direct current mixing grid power electronic transformer passing through DC Line Fault Download PDFInfo
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- CN110311381A CN110311381A CN201910596946.1A CN201910596946A CN110311381A CN 110311381 A CN110311381 A CN 110311381A CN 201910596946 A CN201910596946 A CN 201910596946A CN 110311381 A CN110311381 A CN 110311381A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses the alternating current-direct current mixing grid power electronic transformers that one kind can pass through DC Line Fault, comprising: high voltage input stage, intermediate isolating grade and low pressure output stage.The high voltage input stage is the mixing module combination multi-level converter for exchanging side cascaded H-bridges+MMC structure.The intermediate isolating grade is made of double active bridging parallel operations of the identical input series and output parallel of several structures.The low pressure output stage includes a DC/AC three-phase inversion module, for powering to low-voltage alternating-current load.The present invention can be realized the two-way flow of power, improve power quality；And multiple ports are provided, wind energy, solar energy distributed power supply and each type load and energy storage device can be flexibly accessed.When DC side breaks down, the self-cleaning of failure can be fast implemented, to realize that DC Line Fault passes through.
Description
Technical field
The present invention relates to the alternating current-direct current mixing grid power electronic transformers that one kind can pass through DC Line Fault, belong to electric power electricity
Sub- equipment technical field.
Background technique
Currently, important component of the power transformer as electric system, voltage class conversion and electrical is mainly undertaken
It is isolated, the function of energy transmission.But traditional transformer has a single function, and it is bulky, and electric system is being disturbed
It and in the case where breaking down, can be transmitted by transformer, cannot achieve isolation.
Therefore, traditional power transformer can no longer meet the demand of power network development.In recent years, with renewable energy
The general of electric power electric transformer has been drawn in access low-voltage alternating-current, the needs of DC grid and the progress of power semiconductor technologies
It reads.It is a kind of novel transformation that electric energy high efficiency of transmission and transformation are realized using Technics of Power Electronic Conversion technology and electromagnetic induction principle
Device can also be achieved power flowcontrol, reactive compensation and utility power quality control etc. in addition to the basic function with traditional transformer
Multiple functions, in the power system using very extensive.
In recent years, gradually having drawn with the development of smart grid, renewable energy and extra-high voltage technology can source interconnection
The concept of net.Energy internet requires not only to realize the reliable of different voltages grade, alternating current-direct current power grid and alternating current-direct current load
Connection, while the control performance for needing to have excellent.To realize transmission and transformation in energy internet between multi-source, more loads
Then need the InterWorking Equipment using multiterminal.Electric power electric transformer possesses more accessible port, it may be convenient to realize electricity
It can be accessed convenient for renewable energy and electric car etc. in the transmission and transformation between alternating current-direct current, high-low pressure, trend may be implemented
Two-way flow and unity power factor control, therefore electric power electric transformer is set as the core of alternating current-direct current mixing power grid
It is standby, it has a extensive future.
Currently, it is one of research hotspot problem in alternating current-direct current mixing power grid that DC Line Fault, which passes through,.It is therefore desirable to propose one
Kind can pass through the alternating current-direct current mixing grid power electronic transformer of DC Line Fault.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, it is straight that the present invention provides a kind of friendship that can pass through DC Line Fault
Stream mixing grid power electronic transformer, the application for existing high voltage input stage mainly use MMC structure, MMC submodule
Mainly there are half-bridge submodule and two kinds of full-bridge submodule.The MMC structure being made of half-bridge submodule is simple, but does not have DC side
Short trouble self-cleaning ability；The MMC being made of full-bridge submodule has dc-side short-circuit fault self-cleaning ability, but needs double
Device, structure is complicated, with high costs.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of alternating current-direct current mixing grid power electronic transformer passing through DC Line Fault, comprising: high voltage input stage, centre
Isolation level and low pressure output stage, the high voltage input stage are mostly electric using the mixing module combination of exchange side cascaded H-bridges+MMC structure
Flat converter, exchange side bridge arm are connected to AC network, upper bridge arm and lower bridge arm respectively as the positive and negative anodes of DC network；Institute
It states intermediate isolating grade to be made of the identical secondary side of primary side series connection of several structures double active bridging parallel operations in parallel, double active bridgings
Parallel operation primary side port is connected with the positive and negative anodes of DC network, and double active bridging parallel operation pair side end mouths are connected to DC.low voltage network；
The low pressure output stage includes a DC/AC three-phase inversion module, for powering to low-voltage alternating-current load.
Preferably, the voltage of the AC network uses 10kV.
Preferably, the mixing module of the exchange side cascaded H-bridges+MMC structure combines multi-level converter, packet
Include: upper bridge arm, lower bridge arm, exchange side bridge arm, the upper bridge arm include bridge arm in a phase, bridge arm in b phase, bridge arm in c phase, a
Bridge arm in phase, bridge arm in b phase, the anode that the input terminal of bridge arm is connected as DC network in c phase；Bridge arm packet in a phase
Include: n half-bridge submodule and inductance L, n half-bridge submodule, inductance L are sequentially connected in series, and the first half-bridge submodule input terminal is as a
Bridge arm input terminal in phase, the inductance other end is as bridge arm output end in a phase；Bridge arm in the b phase, in c phase bridge arm structure and a
Bridge arm is identical in phase；The lower bridge arm includes a phase lower bridge arm, b phase lower bridge arm, c phase lower bridge arm, under a phase lower bridge arm, b phase
The cathode that is connected as DC network of output end of bridge arm, c phase lower bridge arm；The a phase lower bridge arm includes: n half-bridge submodule
Block and inductance L, inductance L are sequentially connected in series with n half-bridge submodule, and the input terminal of inductance L is as a phase lower bridge arm input terminal, finally
The output end of one half-bridge submodule is as a phase lower bridge arm output end；The b phase lower bridge arm, structure and a phase of c phase lower bridge arm
Lower bridge arm is identical；The output end of bridge arm is connected with the input terminal of a phase lower bridge arm in a phase, in b phase the output end of bridge arm with
The input terminal of b phase lower bridge arm is connected, and the output end of bridge arm is connected with the input terminal of c phase lower bridge arm in c phase；Exchange side bridge arm
It include: that a phase exchanges side bridge arm, b phase exchanges side bridge arm, c phase exchanges side bridge arm, a phase exchanges side bridge arm by m full-bridge submodule
Block is sequentially connected in series, and first full-bridge submodule input terminal exchanges side bridge arm input terminal as a phase, the last one full-bridge submodule is defeated
Outlet exchanges side bridge arm output end as a phase, and a phase exchanges the company of side bridge arm output end with bridge arm in a phase and a phase lower bridge arm
The place of connecing is connected；The b phase exchanges side bridge arm, c phase exchanges the structure of side bridge arm and a phase exchanges that side bridge arm is identical, and b phase exchanges side
Bridge arm output end is connected with the junction of bridge arm in b phase and b phase lower bridge arm, and c phase exchanges side bridge arm output end and bridge arm in c phase
It is connected with the junction of c phase lower bridge arm；The b phase exchanges side bridge arm, c phase exchanges the structure of side bridge arm and exchanges side bridge with a phase
Arm is identical.
Preferably, first double active bridging parallel operation primary side input terminal is connected with upper bridge arm, the last one is double
Active bridging parallel operation primary side output end is connected with lower bridge arm.
Preferably, the DC/AC three-phase inversion module includes six groups of IGBT and antiparallel diode therewith, structure
It powers at three phase full bridge structure for low-voltage direct to be converted into 380V exchange for low-voltage alternating-current load.
Preferably, the full-bridge submodule, by first switch tube T11, second switch T12, third switching tube
T13, the 4th switch transistor T14With first capacitor C1It constitutes；First switch tube T11Collector and first capacitor C1Anode, second open
Close pipe T12Collector connection, first switch tube T11Emitter and third switch transistor T13Collector connection, second switch
T12Emitter and the 4th switch transistor T14Collector connection, third switch transistor T13Emitter and first capacitor C1Cathode,
4th switch transistor T14Emitter connection；Third switch transistor T13Collector, the 4th switch transistor T14Collector as full-bridge
The input of module, output both ends.
Preferably, the half-bridge submodule, by the 5th switch transistor T15, the 6th switch transistor T16With the second capacitor C2Structure
At；5th switch transistor T15Collector and the second capacitor C2Anode connection, the second capacitor C2Cathode and the 6th switch transistor T16's
Emitter connection, the 5th switch transistor T15Emitter and the 6th switch transistor T16Collector connection；6th switch transistor T16Current collection
The input as half-bridge submodule of pole and emitter, output both ends.
Preferably, double active bridging parallel operations include: dual H-bridge module and high frequency transformer；The H bridge module
Comprising four groups of IGBT and therewith antiparallel freewheeling diode；The high-voltage alternating of primary side is electrically coupled to pair by the high frequency transformer
Side obtains low-voltage AC, to realize the electrical isolation between high-low pressure.
The utility model has the advantages that one kind provided by the invention can pass through the alternating current-direct current mixing grid power electronic transformer of DC Line Fault
The functions such as voltage transformation, the electrical isolation of traditional power transformer may be implemented in device.High voltage input stage is using exchange side Cascade H
The structure of bridge+MMC realizes dc-side short-circuit fault certainly by the failure blocking ability using exchange side bridge arm full-bridge submodule
It removes.By increasing MMC half-bridge submodule number, voltage class can be improved, and convenient for extension and maintenance.In addition it can mention
For flexible AC and DC interface, the access convenient for distributed generation resource and the power supply to DC load realize that alternating current-direct current mixing power grid is more
It is port interconnected.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is that mesohigh input stage of the present invention exchanges side bridge arm full-bridge sub-modular structure schematic diagram；
Fig. 3 is mesohigh input stage half-bridge sub-modular structure schematic diagram of the present invention；
Fig. 4 is that one kind can pass through intermediate isolating grade transformation in the alternating current-direct current mixing grid power electronic transformer of DC Line Fault
The structural schematic diagram of device；
Fig. 5 is the mixing module combination multilevel that mesohigh input stage of the present invention exchanges side cascaded H-bridges+MMC structure
Equivalent circuit when short trouble occurs for device DC side.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawing.
As shown in Figure 1, a kind of alternating current-direct current mixing grid power electronic transformer structure that can pass through DC Line Fault, includes:
High voltage input stage, intermediate isolating grade and low pressure output stage.The high voltage input stage is mixed using exchange side cascaded H-bridges+MMC structure
Close block combiner multi-level converter, exchange side bridge arm be connected to 10kV AC network, upper bridge arm and lower bridge arm respectively as
The positive and negative anodes of 10kV DC network；The intermediate isolating grade is double active by the secondary side parallel connection of the identical primary side series connection of several structures
Bridging parallel operation composition, double active bridging parallel operation primary side input ports are connected with the positive and negative anodes of 10kV DC network, double active bridgings
Parallel operation pair side output port is connected to DC.low voltage network；The low pressure output stage includes a DC/AC three-phase inversion module, is used
It powers in low-voltage alternating-current load.
The mixing module of the exchange side cascaded H-bridges+MMC structure combines multi-level converter, comprising: upper bridge arm, lower bridge
Arm, exchange side bridge arm, the upper bridge arm include bridge arm in a phase, bridge arm in b phase, bridge arm in c phase, bridge arm in a phase, in b phase
The anode that the input terminal of bridge arm is connected as DC network on bridge arm, c phase；Bridge arm includes: n half-bridge submodule in a phase
Block (HBSM1、HBSM2、……、HBSMn) and inductance (L), n half-bridge submodule (HBSM1、HBSM2、……、HBSMn), inductance
(L) it is sequentially connected in series, for the first half-bridge submodule input terminal as bridge arm input terminal in a phase, the inductance other end is defeated as bridge arm in a phase
Outlet；Bridge arm in the b phase, the structure of bridge arm is identical as bridge arm in a phase in c phase；The lower bridge arm includes a phase lower bridge arm, b phase
Lower bridge arm, c phase lower bridge arm, a phase lower bridge arm, b phase lower bridge arm, c phase lower bridge arm output end be connected as DC network
Cathode；The a phase lower bridge arm includes: n half-bridge submodule (HBSM1、HBSM2、……、HBSMn) and inductance (L), inductance
(L) with n half-bridge submodule (HBSM1、HBSM2、……、HBSMn) be sequentially connected in series, the input terminal of inductance (L) is as bridge under a phase
Arm input terminal, the output end of the last one half-bridge submodule is as a phase lower bridge arm output end；Bridge under the b phase lower bridge arm, c phase
The structure of arm is identical as a phase lower bridge arm；The output end of bridge arm is connected with the input terminal of a phase lower bridge arm in a phase, in b phase
The output end of bridge arm is connected with the input terminal of b phase lower bridge arm, the input terminal phase of the output end of bridge arm and c phase lower bridge arm in c phase
Connection；Exchanging side bridge arm includes: that a phase exchanges side bridge arm, b phase exchanges side bridge arm, c phase exchanges side bridge arm, and a phase exchanges side bridge
Arm is by m full-bridge submodule (FBSM1、FBSM2、……、FBSMm) be sequentially connected in series, first full-bridge submodule input terminal is as a
Mutually exchange side bridge arm input terminal, the last one full-bridge submodule output end exchange side bridge arm output end, a intersection as a phase
Stream side bridge arm output end is connected with the junction of bridge arm in a phase and a phase lower bridge arm；The b phase exchanges side bridge arm, c phase exchanges
The structure of side bridge arm exchanges that side bridge arm is identical with a phase, and b phase exchanges the company of side bridge arm output end with bridge arm in b phase and b phase lower bridge arm
The place of connecing is connected, and c phase exchanges side bridge arm output end and is connected with the junction of bridge arm in c phase and c phase lower bridge arm；The b intersection
Stream side bridge arm, c phase exchange the structure of side bridge arm and a phase to exchange side bridge arm identical.
First double active bridging parallel operation primary side input terminal is connected with upper bridge arm, the last one double active bridging parallel operation is former
Side output end is connected with lower bridge arm.
The DC/AC three-phase inversion module antiparallel diode comprising six groups of IGBT and therewith, constitutes three phase full bridge knot
Structure is powered for low-voltage direct to be converted into 380V exchange for low-voltage alternating-current load.
As shown in Fig. 2, the full-bridge submodule, by first switch tube T11, second switch T12, third switch transistor T13,
Four switch transistor Ts14With first capacitor C1It constitutes；First switch tube T11Collector and first capacitor C1Anode, second switch
T12Collector connection, first switch tube T11Emitter and third switch transistor T13Collector connection, second switch T12's
Emitter and the 4th switch transistor T14Collector connection, third switch transistor T13Emitter and first capacitor C1Cathode, the 4th
Switch transistor T14Emitter connection；Third switch transistor T13Collector, the 4th switch transistor T14Collector as full-bridge submodule
Input, output both ends；Above-mentioned switching tube is all made of IGBT.
As shown in figure 3, the half-bridge submodule, by the 5th switch transistor T15, the 6th switch transistor T16With the second capacitor C2It constitutes；
5th switch transistor T15Collector and the second capacitor C2Anode connection, the second capacitor C2Cathode and the 6th switch transistor T16Transmitting
Pole connection, the 5th switch transistor T15Emitter and the 6th switch transistor T16Collector connection；6th switch transistor T16Collector and
Emitter as half-bridge submodule input, output both ends.
As shown in figure 4, double active bridging parallel operations include: dual H-bridge module and high frequency transformer；The H bridge module packet
Containing four groups of IGBT and therewith antiparallel freewheeling diode；The high-voltage alternating of primary side is electrically coupled to pair by the high frequency transformer
Side obtains low-voltage AC, to realize the electrical isolation between high-low pressure.
By taking the mixing module combination multilevel converter of high voltage input stage exchange side cascaded H-bridges+MMC structure as an example, when straight
Flow side occur short trouble when, be latched all switching tubes controlled when DC side breaks down it is all switch be turned off, etc.
Circuit is imitated as shown in figure 5, running the three-phase uncontrollable rectifier device for being equivalent to DC side parallel capacitor, short circuit current can be made to subtract rapidly
It is few, to realize that dc-side short-circuit fault passes through.The present invention can be realized the two-way flow of power, improve power quality；And
Multiple ports are provided, wind energy, solar energy distributed power supply and each type load and energy storage device can be flexibly accessed.In DC side
When breaking down, the self-cleaning of failure can be fast implemented, to realize that DC Line Fault passes through.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (8)
1. the alternating current-direct current mixing grid power electronic transformer that one kind can pass through DC Line Fault, comprising: high voltage input stage, middle interval
From grade and low pressure output stage, it is characterised in that: the high voltage input stage is using the mixing module for exchanging side cascaded H-bridges+MMC structure
Multi-level converter is combined, exchange side bridge arm is connected to AC network, and upper bridge arm and lower bridge arm are respectively as DC network
Positive and negative anodes；The intermediate isolating grade is made of the identical secondary side of primary side series connection of several structures double active bridging parallel operations in parallel,
Double active bridging parallel operation primary side ports are connected with the positive and negative anodes of DC network, and double active bridging parallel operation pair side end mouths are connected to low pressure
DC network；The low pressure output stage includes a DC/AC three-phase inversion module, for powering to low-voltage alternating-current load.
2. one kind according to claim 1 can pass through the alternating current-direct current mixing grid power electronic transformer of DC Line Fault,
Be characterized in that: the voltage of the AC network uses 10kV.
3. one kind according to claim 1 can pass through the alternating current-direct current mixing grid power electronic transformer of DC Line Fault,
It is characterized in that: the mixing module combination multi-level converter of the exchange side cascaded H-bridges+MMC structure, comprising: upper bridge arm, lower bridge
Arm, exchange side bridge arm, the upper bridge arm include bridge arm in a phase, bridge arm in b phase, bridge arm in c phase, bridge arm in a phase, in b phase
The anode that the input terminal of bridge arm is connected as DC network on bridge arm, c phase；Bridge arm includes: n half-bridge submodule in a phase
Block and inductance L, n half-bridge submodule, inductance L are sequentially connected in series, and the first half-bridge submodule input terminal is inputted as bridge arm in a phase
End, the inductance other end is as bridge arm output end in a phase；Bridge arm in the b phase, in c phase bridge arm structure and bridge arm phase in a phase
Together；The lower bridge arm includes a phase lower bridge arm, b phase lower bridge arm, c phase lower bridge arm, under a phase lower bridge arm, b phase lower bridge arm, c phase
The output end of bridge arm is connected the cathode as DC network；The a phase lower bridge arm includes: n half-bridge submodule and inductance L,
Inductance L is sequentially connected in series with n half-bridge submodule, and the input terminal of inductance L is as a phase lower bridge arm input terminal, the last one half-bridge
The output end of module is as a phase lower bridge arm output end；The b phase lower bridge arm, the structure of c phase lower bridge arm are identical as a phase lower bridge arm；
The output end of bridge arm is connected with the input terminal of a phase lower bridge arm in a phase, the output end of bridge arm and b phase lower bridge arm in b phase
Input terminal is connected, and the output end of bridge arm is connected with the input terminal of c phase lower bridge arm in c phase；Exchange side bridge arm includes: a intersection
Stream side bridge arm, b phase exchanges side bridge arm, c phase exchanges side bridge arm, and a phase exchanges side bridge arm and successively gone here and there by m full-bridge submodule
Connection, first full-bridge submodule input terminal exchange side bridge arm input terminal as a phase, the last one full-bridge submodule output end conduct
A phase exchanges side bridge arm output end, and a phase exchanges side bridge arm output end and is connected with the junction of bridge arm in a phase and a phase lower bridge arm
It connects；The b phase exchanges side bridge arm, c phase exchanges the structure of side bridge arm and a phase to exchange side bridge arm identical, b phase exchanges the output of side bridge arm
End be connected with the junction of bridge arm in b phase and b phase lower bridge arm, c phase exchange side bridge arm output end under bridge arm and c phase in c phase
The junction of bridge arm is connected；The b phase exchanges side bridge arm, c phase exchanges the structure of side bridge arm and a phase to exchange side bridge arm identical.
4. one kind according to claim 3 can pass through the alternating current-direct current mixing grid power electronic transformer of DC Line Fault,
Be characterized in that: first double active bridging parallel operation primary side input terminal is connected with upper bridge arm, the last one double active bridging parallel operation
Primary side output end is connected with lower bridge arm.
5. one kind according to claim 1 can pass through the alternating current-direct current mixing grid power electronic transformer of DC Line Fault,
Be characterized in that: the DC/AC three-phase inversion module antiparallel diode comprising six groups of IGBT and therewith constitutes three phase full bridge knot
Structure is powered for low-voltage direct to be converted into 380V exchange for low-voltage alternating-current load.
6. one kind according to claim 3 can pass through the alternating current-direct current mixing grid power electronic transformer of DC Line Fault,
It is characterized in that: the full-bridge submodule, by first switch tube T11, second switch T12, third switch transistor T13, the 4th switching tube
T14With first capacitor C1It constitutes；First switch tube T11Collector and first capacitor C1Anode, second switch T12Current collection
Pole connection, first switch tube T11Emitter and third switch transistor T13Collector connection, second switch T12Emitter with
4th switch transistor T14Collector connection, third switch transistor T13Emitter and first capacitor C1Cathode, the 4th switch transistor T14
Emitter connection；Third switch transistor T13Collector, the 4th switch transistor T14Collector as full-bridge submodule input,
Export both ends.
7. one kind according to claim 3 can pass through the alternating current-direct current mixing grid power electronic transformer of DC Line Fault,
It is characterized in that: the half-bridge submodule, by the 5th switch transistor T15, the 6th switch transistor T16With the second capacitor C2It constitutes；5th switch
Pipe T15Collector and the second capacitor C2Anode connection, the second capacitor C2Cathode and the 6th switch transistor T16Emitter connection,
5th switch transistor T15Emitter and the 6th switch transistor T16Collector connection；6th switch transistor T16Collector and emitter
Input, output both ends as half-bridge submodule.
8. one kind according to claim 1 can pass through the alternating current-direct current mixing grid power electronic transformer of DC Line Fault,
Be characterized in that: double active bridging parallel operations include: dual H-bridge module and high frequency transformer；The H bridge module includes four groups of IGBT
Antiparallel freewheeling diode therewith；The high-voltage alternating of primary side is electrically coupled to secondary side by the high frequency transformer, obtains low pressure
Alternating current, to realize the electrical isolation between high-low pressure.
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| CN110829452A (en) * | 2019-11-14 | 2020-02-21 | 南京工程学院 | Reactive current control method for reducing fault ride-through impact of alternating current-direct current hybrid power distribution network |
| CN110808604A (en) * | 2019-11-18 | 2020-02-18 | 广东电网有限责任公司 | Three-port energy control device based on MMC structure |
| CN111864785A (en) * | 2020-08-14 | 2020-10-30 | 华中科技大学 | Alternating current-direct current fault-resistant alternating current side cascade type hybrid MMC topology and control method thereof |
| CN113098044A (en) * | 2021-03-26 | 2021-07-09 | 广东电网有限责任公司 | Current converter-based power distribution system and power distribution method |
| CN113098044B (en) * | 2021-03-26 | 2023-01-24 | 广东电网有限责任公司 | Current converter-based power distribution system and power distribution method |
| CN113300607A (en) * | 2021-05-26 | 2021-08-24 | 西安交通大学 | Double-active-bridge submodule based on full-bridge interface, direct-current transformer and control method of direct-current transformer |
| CN114050566A (en) * | 2021-08-19 | 2022-02-15 | 天津大学 | Short-circuit fault ride-through circuit of direct-current power distribution network containing DAB type direct-current transformer |
| CN114050566B (en) * | 2021-08-19 | 2023-06-13 | 天津大学 | Short-circuit fault ride-through circuit of direct-current distribution network containing DAB (DAB) type direct-current transformer |
| CN114268234A (en) * | 2021-12-28 | 2022-04-01 | 东南大学 | High-efficiency low-harmonic hybrid modular multilevel converter and control method thereof |
| CN114268234B (en) * | 2021-12-28 | 2023-08-22 | 东南大学 | Efficient low-harmonic hybrid modular multilevel converter and control method thereof |
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Application publication date: 20191008 |